<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        .box1 {
            /* 加 float 之后就不是标准流了，它会浮到标准流的上面 */
            float: left;
            width: 200px;
            height: 200px;
            background-color: pink;
        }

        .box2 {
            width: 150px;
            height: 300px;
            background-color: sky;
        }
    </style>
</head>
<body>
    <div class="box1"></div>
    <div class="box2"></div>

</body>
</html>